A) 3 km |
B) 4 km |
C) 1 km |
D) 2 km |
A) 3 km |
Let the distance be x km.
Because, Speed of the man in still water = km/h
and speed of the river = 1.5 km/h
Therefore, Speed of the man downstream = 7.5 + 1.5 = 9
Speed of the man upstream = 7.5 - 1.5 = 6 km/h
According to the question,
\( \Large \frac{x}{9}+\frac{x}{6}=\frac{50}{60} \)
\( \Large \frac{4x+6x}{36}=\frac{50}{60} \)
\( \Large \frac{10x}{36}=\frac{50}{60} \)
\( \Large x = \frac{50 \times 36}{10 \times 60} \) = x = 3 km